We have created high-precision, miniaturized, substrate-free filters, based on ion beam sputtering on a sacrificial substrate. The sacrificial layer is cost efficient and environmentally friendly and can be dissolved using only water. We demonstrate an improved performance compared to filters on thin polymer layers from the same coating run. With these filters, a single-element coarse wavelength division multiplexing transmitting device for telecommunication applications can be realized by inserting the filter between fiber ends.
To unlock the benefits of thin-film filters, produced by means of ion beam sputtering, for compact, hybrid integrated optical systems, we have implemented a sacrificial-substrate approach to create high-precision, miniaturized, substrate-free filters.
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